Gang In Ho is the newly appointed art teacher at Gwangju Inhwa School, a school for hearing-impaired children. He is excited to teach his new students, yet the children are aloof and distant, trying to avoid running into him as much as possible. When the children finally open up, In Ho faces the shocking and ugly truth about the school and what the students have been enduring in secret; the children are being physically and sexually abused by their teachers. The movie is based on a true story.